<?php
/**
 * Created by PhpStorm.
 * User: denh
 * Date: 16/5/18
 * Time: 上午11:47
 */
namespace tools;
class Page {
    public $total;      //总记录
    public $pagesize;    //每页显示多少条
    public $limit;          //limit
    public $page;           //当前页码
    public $pagenum;      //总页码
    public $url;           //地址
    public $bothnum;      //两边保持数字分页的量

    //构造方法初始化
    public function __construct($_total, $_pagesize) {
       // $this->total = $_total ? $_total : 1;
        $this->total = $_total;
        $this->pagesize = $_pagesize;
        $this->pagenum = ceil($this->total / $this->pagesize);
        $this->page = $this->setPage();
        $this->limit = ($this->page-1) * $this->pagesize;
        $this->url = $this->setUrl();
        $this->bothnum = 2;
    }

    //拦截器
    private function __get($_key) {
        return $this->$_key;
    }

    //获取当前页码
    private function setPage() {
        if (!empty($_GET['page'])) {
            if ($_GET['page'] > 0) {
                if ($_GET['page'] > $this->pagenum) {
                    return $this->pagenum;
                } else {
                    return $_GET['page'];
                }
            } else {
                return 1;
            }
        } else {
            return 1;
        }
    }

    //获取地址
    private function setUrl() {
        $_url = $_SERVER["REQUEST_URI"];
        $_par = parse_url($_url);
        if (isset($_par['query'])) {
            parse_str($_par['query'],$_query);
            unset($_query['page']);
            $_url = $_par['path'].'?'.http_build_query($_query);
        }
        return $_url;
    }

    //数字目录
    private function pageList() {
        $_pagelist = '';
        for ($i=$this->bothnum;$i>=1;$i--) {
            $_page = $this->page-$i;
            if ($_page < 1) continue;
            $_pagelist .= ' <a href="'.$this->url.'&page='.$_page.'">'.$_page.'</a> ';
        }
        $_pagelist .= ' <span class="me">'.$this->page.'</span> ';
        for ($i=1;$i<=$this->bothnum;$i++) {
            $_page = $this->page+$i;
            if ($_page > $this->pagenum) break;
            $_pagelist .= ' <a href="'.$this->url.'&page='.$_page.'">'.$_page.'</a> ';
        }
        return $_pagelist;
    }

    //首页
    private function first() {
        if ($this->page > $this->bothnum+1) {
            return ' <a href="'.$this->url.'">1</a> ...';
        }
    }

    //上一页
    private function prev() {
        if ($this->page == 1) {
            return '<span class="back_page disabled">上一页</span>';
        }
        return ' <a class="back_page" href="'.$this->url.'&page='.($this->page-1).'">上一页</a> ';
    }

    //下一页
    private function next() {
        if ($this->page == $this->pagenum) {
            return '<span class="next_page disabled">下一页</span> 共'.$this->total.'条';
        }
        return ' <a class="next_page" href="'.$this->url.'&page='.($this->page+1).'">下一页</a> '.'共'.$this->total.'条';
    }

    //数据总条数
    private  function next_weixin(){
        if ($this->page == $this->pagenum) {
            return '<span class="next_page disabled">下一页</span>';
        }
        return ' <a class="next_page" href="'.$this->url.'&page='.($this->page+1).'">下一页</a> ';
    }


    //尾页
    private function last() {
        if ($this->pagenum - $this->page > $this->bothnum) {
            return ' ...<a href="'.$this->url.'&page='.$this->pagenum.'">'.$this->pagenum.'</a> ';
        }
    }

    //提示当前页和总页数
    private function page_tips(){
        if($this->total == 0){
            return "<div class='page_tips'>当前0页/共0页</div>";
        }
        return "<div class='page_tips'>当前". $this->setPage() ."页/共". $this->pagenum."页</div>";
    }

    //分页信息
    public function showpage() {
        $_page = '';
        $_page .= $this->prev();
        $_page .= $this->first();
        $_page .= $this->pageList();
        $_page .= $this->last();
        $_page .= $this->next();

        return $_page;
    }

    //微信端的分页显示
    //分页信息
    public function showpage_weixin() {
        $_page = '';
        if($this->page != $this->pagenum && $this->total != 0){
            $_page .= $this->next_weixin();
        }
        if($this->page != 1 && $this->total != 0) {
            $_page .= $this->prev();
        }
        $_page .= $this->page_tips();

        return $_page;
    }
}
